@Kitonum Thank you so much! I don't understand why you use p[-1], not use p[i]. Can you explain it to me? Sorry, I know a bit little English so It can make me don't understand my mind. 

@vv Thank you. I have just learn about Maple, so I lack of knowledge. Thanks for your help! :D

@Kitonum thank you so much. do you know write Neville algorithm? 

Input: M:=-2,-1,0,1,2(n=5); f=2^x; X

output: Q table with P(x)=Q_n,n

for i:=2,..5

   for j:=2,..i

       Q_i,j:=((X-M[i-j])*Q_i,j-1-(X-M[i])*Q_i-1,j-1))/(M[i]-M[i-j])

OUPUT(Q)

I don't know how write it. can you help me? sorry, my english is not very good

@Preben Alsholm  thank you

@acer but I don't want to copy. I want to do one by one code. What should I do?

@Markiyan Hirnyk Yes. "the code in the picture is not a procedure at all". 

I have copy your statemens and Maple have done "AnimatingPacman". but I have do one by one, Maple notice "Error". Example like below. I don't understand. Do you understand me? sorry you because my english is not very good

@Markiyan Hirnyk Yes. But I don't understand your mean. like this

@Markiyan Hirnyk Hi. Thanks you so much.I've read it. But when I do in Maple, frame:=proc(n), Maple notices "Error". I don't understand

@Robert Israel I do frame:=proc(n) but Maple notice erro

@Carl Love Sorry, I just started to learn about maple, so I lack of knowledge. sorry you

@Carl Love  can you draw another house by polygonplot? Can you give me form of polygonplot? Sorry, my English is not very good. If it makes you unhappy, I am sorry

@Carl Love Thanks for your help!

@Rouben Rostamian   I'm really grateful to you. 

@huongnhung95 

@Rouben Rostamian  Thanks you so much. I'm about to say that: